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Big Agnes
Cinnabar Sleeping Bag: -20F Down

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Cinnabar Sleeping Bag

The Cinnabar Sleeping Bag is the warmest option from Big Agnes. Its sub-zero rated down insulation is intended for expeditions like 8000m summits, self-supported missions across Antarctica, and all-around winter camping and backpacking. Despite being the warmest, the down insulation is surprisingly light, lofty, and packable. Big Agnes treated the down to retain its lofty warmth if it ever got wet, which would be difficult to do considering water-resistant, windproof Pertex Quantum protects it from winter's weather. The footbox features a burlier Pertex Quantum Pro waterproofing that comes in handy when moisture inside the tent drips down the walls and onto your feet.


  • The warmest Big Agnes sleeping bag for 8000m expeditions
  • 850-fill down insulation has a -20F temperature rating
  • DownTek hydrophobic coating keeps the down lofty in wetness
  • Pertex Quantum shell is windproof and water-resistant
  • Pertex Quantum Pro footbox adds waterproofing where it counts
  • Draft collar runs down full-length zipper and around hood
  • Internal mesh pocket stashes phones, headlamps, and other essentials
  • Stuff and storage sacks included
  • Item #BAGZ28D
Responsible Collection
[shell] Pertex Quantum Pro (100% recycled nylon ripstop) [lining] 100% polyester taffeta
850-fill down, DownTek (PFC free)
mummy (room for layering]
full-length, YKK #5
Max User Height
[small] 5ft 5in [regular] 6ft [long] 6ft 6in
Shoulder Circumference
[small] 58in [regular] 64in [long] 66in
Hip Circumference
[small] 58in [regular] 58in [long] 60in
Foot Circumference
[small] 38in [regular] 40in [long] 42in
Bag Length
[small] 5ft 5in [regular] 6ft [long] 6ft 6in
Draft Tube
zipper, hood
1 internal
Pad Retainer
Fill Weight
[small] 34oz [regular] 36oz [long] 38oz
Storage Sack
Stuff Sack
Stuff Size
[small, regular] 9 x 20in [long] 10 x 21in
Claimed Weight
[small] 3lb 4oz, [regular] 3lb 9oz, [long] 3lb 14oz
Manufacturer Warranty